WO2012164915A2 - Dispositif de détection et capteur de courant - Google Patents

Dispositif de détection et capteur de courant Download PDF

Info

Publication number
WO2012164915A2
WO2012164915A2 PCT/JP2012/003508 JP2012003508W WO2012164915A2 WO 2012164915 A2 WO2012164915 A2 WO 2012164915A2 JP 2012003508 W JP2012003508 W JP 2012003508W WO 2012164915 A2 WO2012164915 A2 WO 2012164915A2
Authority
WO
WIPO (PCT)
Prior art keywords
amplifying
reference voltage
output
detecting device
amplification
Prior art date
Application number
PCT/JP2012/003508
Other languages
English (en)
Other versions
WO2012164915A3 (fr
Inventor
Hiroshi Ueno
Kenji Kanemaru
Daisuke Mori
Francois Piette
Wouter Leten
Original Assignee
Kabushiki Kaisha Tokai Rika Denki Seisakusho
Melexis Nv
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kabushiki Kaisha Tokai Rika Denki Seisakusho, Melexis Nv filed Critical Kabushiki Kaisha Tokai Rika Denki Seisakusho
Priority to EP12737616.8A priority Critical patent/EP2715385B1/fr
Priority to US14/118,759 priority patent/US9291666B2/en
Priority to CN201280026636.2A priority patent/CN103703382B/zh
Publication of WO2012164915A2 publication Critical patent/WO2012164915A2/fr
Publication of WO2012164915A3 publication Critical patent/WO2012164915A3/fr

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28—Testing of electronic circuits, e.g. by signal tracer
    • G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
    • G01R31/2829—Testing of circuits in sensor or actuator systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
    • G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
    • G01R33/07—Hall effect devices
    • G01R33/072—Constructional adaptation of the sensor to specific applications
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
    • G01R33/09—Magnetoresistive devices
    • G01R33/091—Constructional adaptation of the sensor to specific applications

Definitions

  • This invention relates to a detecting device and a current sensor.
  • a current sensor device includes a magnetic core configured to have a ring-like shape with voids and focus magnetic flux generated by a current to be measured that flows through an object to be measured inserted into a central part of the ring-like shape, a Hall element configured to be arranged in the voids of the magnetic core and output an electrical signal according to the magnetic flux, an inspection conductor configured to apply a predetermined magnetic flux generated by allowing a predetermined inspection current to flow therethrough to the Hall element, and an amplifier configured to amplify a Hall signal output from the Hall element (for example, refer to JP-A-2010-133737).
  • the current sensor device is capable of detecting a failure of the Hall element based on the Hall signal that is output from the Hall element and is amplified by the amplifier when the current to be measured does not flow through the object to be measured, and the inspection current is allowed to flow through the inspection conductor.
  • the conventional current sensor device since the conventional current sensor device is not able to check whether the Hall signal of the Hall element is amplified with a proper amplification factor or not, it has a problem that when the Hall signal predetermined is not output, it cannot judge whether the fact of the Hall signal not being output is caused by the failure of the Hall element or caused by that the amplification factor of the amplifier is different from a predetermined amplification factor.
  • the present application is based on Japanese patent application No. 2011-120195 filed on May 30, 2011, the entire contents of which are incorporated herein by reference.
  • a detecting device comprises: a detecting part configured to detect a change in an object to be detected so as to output a detection signal; an amplifying part configured to amplify the detection signal output from the detecting part so as to output a first amplification signal; a reference voltage supply part configured to supply a reference voltage to the amplifying part, the reference voltage being input to the amplifying part so as to be output as a second amplification signal; a switching part configured to switch a connection between the detecting part and the amplifying part or a connection between the amplifying part and the reference voltage supply part based on a control signal input thereto; and a comparing part configured to compare a predetermined amplification factor in the amplifying part, with an amplification factor obtained from the second amplification signal so as to output the comparison result as a comparison signal.
  • the detecting part comprises a magnetic sensor.
  • the magnetic sensor comprises a bridge circuit comprising a first magnetic sensor element to a fourth magnetic sensor element, and the reference voltage supply part generates a first reference voltage corresponding to a first divided voltage of the first magnetic sensor element and the second magnetic sensor element, and a second reference voltage corresponding to a second divided voltage of the third magnetic sensor element and the fourth magnetic sensor element in an initial state.
  • a current sensor comprises: the detecting device according to the above embodiment (1).
  • the current sensor is connected to at least two phases of a three phase motor.
  • the predetermined amplification factor is variable.
  • the detecting device further comprises: a judging part configured to judge an abnormality of the detecting part and the amplifying part based on the comparison signal output from the comparing part.
  • the detecting part comprises an acceleration sensor configured to detect a change in an electrical capacity.
  • a detecting device is configured to compare with an amplified voltage actually output an amplified voltage obtained by differentially amplifying a reference voltage V1 and a reference voltage V2 supplied from a reference voltage supply part.
  • an amplified voltage actually output an amplified voltage obtained by differentially amplifying a reference voltage V1 and a reference voltage V2 supplied from a reference voltage supply part.
  • FIG.1 is a block diagram schematically showing a detecting device according to a first embodiment of the invention
  • FIG.2 is a block diagram schematically showing a detecting device according to a second embodiment of the invention
  • FIG.3A is an explanatory view schematically showing a relationship between a current sensor according to a third embodiment and a three phase motor
  • FIG.3B is an explanatory view schematically showing a relationship between three currents and a rotation angle of the three phase motor
  • FIG.3C is an explanatory view schematically showing a relationship between a current sensor according to Comparative Example 1 and a three phase motor
  • FIG.3D is an explanatory view schematically showing a relationship between a current sensor according to Comparative Example 2 and a three phase motor.
  • the detecting device includes a detecting part configured to detect a change in an object to be detected so as to output a detection signal, an amplifying part configured to amplify the detection signal output from the detecting part so as to output a first amplification signal, a reference voltage supply part configured to supply a reference voltage to the amplifying part, the reference voltage being input to the amplifying part so as to be output as a second amplification signal, a switching part configured to switch a connection between the detecting part and the amplifying part or a connection between the amplifying part and the reference voltage supply part based on a control signal input thereto, and a comparing part configured to compare a predetermined amplification factor in the amplifying part with an amplification factor obtained from the second amplification signal so as to output the comparison result as a comparison signal.
  • FIG.1 is a block diagram schematically showing a detecting device according to a first embodiment of the invention.
  • the detecting device 1 is configured to, for example, judge whether an amplification factor is corresponding to a predetermined amplification factor or not so as to detect an abnormality in sensitivity. Further, hereinafter, a case that the detecting device 1 according to the embodiment is mounted on vehicles will be explained, but not limited to this case.
  • the detecting device 1 is roughly configured to mainly include a Hall sensor 2 as a detecting part configured to detect a change in an object to be detected so as to output a detection signal, an amplifying part 3 configured to amplify the detection signal output from the Hall sensor 2 so as to output a first amplification signal, a reference voltage supply part 4 configured to supply a reference voltage to the amplifying part 3, the reference voltage being input to the amplifying part 3 so as to be output as a second amplification signal, a switching part 5 configured to switch a connection between the Hall sensor 2 and the amplifying part 3 or a connection between the amplifying part 3 and the reference voltage supply part 4 based on a control signal input thereto, and a comparing part 6 configured to compare a predetermined amplification factor in the amplifying part 3 with an amplification factor obtained from the second amplification signal so as to output the comparison result as a comparison signal.
  • a Hall sensor 2 as a detecting part configured to detect a change in an object to be detected so
  • the detecting device 1 is configured to include, for example, a control part 7 and a memory 8. Furthermore, the detecting device 1 is configured to include, for example, two modes.
  • the first mode is, for example, a mode configured to detect an abnormality in sensitivity from an amplification factor of the amplifying part 3.
  • the second mode is, for example, a mode configured to amplify the output from the Hall sensor 2 so as to output it.
  • the Hall sensor 2 is a magnetic sensor using the Hall effect, for example, as shown in FIG.1, it has four terminals 20 to 23.
  • the Hall sensor 2 is configured to, for example, be driven with constant current, and output a change in voltage based on a magnetic field applied thereto.
  • the Hall sensor 2 has, for example, a detection surface to which a magnetic field is applied.
  • the Hall sensor 2 is configured, for example, such that a straight line connecting the centers of the terminal 20 and the terminal 21 is perpendicular to a straight line connecting the centers of the terminal 22 and the terminal 23, and a flat surface formed by the two straight lines configures the detection surface.
  • the terminal 20 is, for example, electrically connected to an input terminal 10, and a constant current I cc is supplied to the terminal 20.
  • the terminal 21 is, for example, electrically connected to a GND terminal 11.
  • the GND terminal 11 is, for example, connected to ground.
  • the terminal 22 is, for example, electrically connected to a switch 50.
  • the terminal 23 is, for example, electrically connected to a switch 51.
  • the Hall sensor 2 is configured to, for example, output an electrical potential (divided voltage V 12 ) generated in a side of the terminal 22 and an electrical potential (divided voltage V 34 ) generated in a side of the terminal 23 due to a component perpendicular to the detection surface of the magnetic field applied to the detection surface, via the terminal 22 and the terminal 23. Further, in a case of a general Hall sensor, even in a state that a magnetic field is not applied or a magnetic field is too small to detect, an unbalanced voltage (an offset voltage) of not being zero is generated in the terminal 22 and the terminal 23, but the Hall sensor 2 according to the embodiment shall be configured such that the offset voltage becomes zero even in a state that a magnetic field is not applied or a magnetic field is too small to detect.
  • an initial state of the detecting device 1 means, for example, a state that a magnetic field is not applied to the Hall sensor 2 or a magnetic field is too small to detect, and an amplification signal obtained by differentially amplifying the divided voltage V 12 and the divided voltage V 34 becomes zero.
  • the amplifying part 3 is configured to include an operational amplifier 30, an input resistance 31 and feedback resistance 32.
  • an inverting input terminal (-) of the operational amplifier 30 for example, the input resistance 31 is electrically connected.
  • a switch 51 and a switch 53 of the switching part 5 described below are electrically connected to an inverting input terminal (+) of the operational amplifier 30, for example.
  • the input resistance 31 has, for example, a resistance value of R 1 .
  • the feedback resistance 32 has, for example, a resistance value of R 2 . Accordingly, an amplification factor of the amplifying part 3 is shown as R 2 / R 1 .
  • the inverting input terminal (-) of the operational amplifier 30 for example, when the switch 50 of the switching part 5 is on-state, the divided voltage V 12 is input via the switch 50 and the input resistance 31.
  • the non-inverting input terminal (+) of the operational amplifier 30 for example, when the switch 51 of the switching part 5 is on-state, the divided voltage V 34 is input via the switch 51.
  • An output terminal of the operational amplifier 30 is electrically connected to, for example, the switch 54 of the switching part 5 and an output terminal 12.
  • the reference voltage supply part 4 is configured to, for example, generate a reference voltage V 1 as a first reference voltage and a reference voltage V 2 as a second reference voltage so as to supply to the amplifying part 3 via the switching part 5.
  • the reference voltage supply part 4 is configured to, as one example, supply the reference voltage V 1 to a side of the inverting input terminal (-) of the operational amplifier 30, and the reference voltage V 2 to a side of the non-inverting input terminal (+) of the operational amplifier 30.
  • the reference voltage supply part 4 is configured to, as one example, generate the reference voltage V 1 of 5 V and the reference voltage V 2 of 0 V.
  • the switching part 5 is configured to, for example, include the switches 50 to 54.
  • the switching part 5 is configured to, for example, be able to be switched between an on-state and an off-state by a switch control signal output from the control part 7 described below.
  • the switch 50 is electrically connected to, for example, the terminal 22 of the Hall sensor 2 at one end thereof, and is electrically connected to the input resistance 31 of the amplifying part 3 and the switch 52 at another end thereof.
  • the switch 51 is electrically connected to, for example, the terminal 23 of the Hall sensor 2 at one end thereof, and is electrically connected to the non-inverting input terminal (+) of the operational amplifier 30 and the switch 53 at another end thereof.
  • the switch 52 is electrically connected, for example, between the switch 50 and the input resistance 31 at one end thereof, and is electrically connected to the reference voltage supply part 4 at another end thereof.
  • the switch 53 is electrically connected, for example, between the switch 51 and the inverting input terminal (-) of the operational amplifier 30 at one end thereof, and is electrically connected to the reference voltage supply part 4 at another end thereof.
  • the switch 54 is electrically connected, for example, between the output terminal of the operational amplifier 30 and the output terminal 12 of the detecting device 1 at one end thereof, and is electrically connected to the comparing part 6 at another end thereof.
  • the comparing part 6 is configured to, for example, be electrically connected to the output terminal of the amplifying part 3 via the switch 54 when the switch 54 of the switching part 5 is positioned at the on-state.
  • the comparing part 6 is configured to, as one example, in the first mode, compare an amplification voltage V 3 differentially amplified based on a reference voltage V 1 and a reference voltage V 2 , and a predetermined amplification voltage obtained by being differentially amplified based on the reference voltage V 1 and the reference voltage V 2 with a predetermined amplification factor in the amplifying part 3.
  • the comparing part 6 is configured to, as one example, include an operational amplifier, and is configured such that the amplification voltage V 3 output from the amplifying part 3 is input to the inverting input terminal (-) of the operational amplifier, and the amplification voltage amplified with a predetermined amplification factor in the amplifying part 3 is input to the non-inverting input terminal (+) of the operational amplifier as a voltage to be compared.
  • the comparing part 6 is configured to, for example, in the first mode, compare the above-mentioned two voltages so as to output a comparison signal indicating that the amplification factor is different in case that they do not coincide with each other.
  • the control part 7 is configured to, for example, control the switching part 5 based on a control signal input via a control terminal 13 and a switch information 80 stored in the memory 8. In addition, the control part 7 is configured to, for example, control the comparing part 6.
  • the memory 8 is configured to, for example, store the switch information 80.
  • the switch information 80 is, for example, information for switching the switches 50 to 54 corresponding to the first mode and the second mode.
  • the control part 7 is configured to generate a switch control signal that in the first mode, allows the switches 50 and 51 to be the off-state, and allows the switches 52 to 54 to be the on-state, so as to output to the switching part 5.
  • the control part 7 is configured to generate a switch control signal that in the second mode, allows the switches 50 and 51 to be the on-state, and allows the switches 52 to 54 to be the off-state, so as to output to the switching part 5.
  • the first mode is, for example, a mode that is executed by using an application of main power of vehicles as a trigger, and that outputs a comparison signal.
  • the second mode is, for example, a mode that outputs the detection signal by the Hall sensor 2.
  • the application of main power of vehicles means, for example, putting an electronic device mounted on vehicles into a state of being operable.
  • the control part 7 switches the switching part 5 in response to the first mode based on the control signal input, so as to allow the reference voltage supply part 4, the amplifying part 3 and the comparing part 6 to be electrically connected with each other.
  • control part 7 obtains the switch information 80 from the memory 8 based on the control signal input from the control terminal 13, and generates the switch control signal corresponding to the first mode based on the switch information 80 obtained. Subsequently, the control part 7 outputs the switch control signal generated to the switching part 5.
  • the switching part 5 allows the switches 50 and 51 to be the off-state, and allows the switches 52 to 54 to be the on-state based on the switch control signal.
  • the reference voltage supply part 4 supplies the reference voltage V 1 and the reference voltage V 2 to the amplifying part 3.
  • the amplifying part 3 outputs the amplification voltage V 3 obtained by differentially amplifying the reference voltage V 1 and the reference voltage V 2 input, to the comparing part 6 via the switch 54.
  • the amplifying part 3 differentially amplifies the reference voltage V 1 and the reference voltage V 2 with the amplification factor corresponding to the input resistance 31 and the feedback resistance 32.
  • the comparing part 6 compares an amplification voltage obtained by differentially amplifying the reference voltage V 1 and the reference voltage V 2 with a predetermined amplification factor, to the amplification voltage V 3 actually output.
  • the comparing part 6 outputs the comparison result as a comparison signal. Subsequently, if the control part 7 judges that the comparison signal has been output, the control part 7 switches the switching part 5 in response to the second mode so as to allow the Hall sensor 2 and the amplifying part 3 to be electrically connected with each other.
  • Comparative Example a detecting device including a Hall sensor and an amplifying part will be explained as Comparative Example.
  • the amplifying part according to Comparative Example is able to amplify an input voltage with a predetermined amplification factor so as to output, when it functions normally.
  • the Hall sensor according to Comparative Example functions normally, the voltage output from the Hall sensor is affected by the influence of an electromagnetic noise and the like generated in vehicles.
  • the detecting device 1 compares an amplification voltage obtained by differentially amplifying the reference voltage V 1 and the reference voltage V 2 supplied from the reference voltage supply part 4, instead of the output from the Hall sensor 2, and an amplification voltage amplified with a predetermined amplification factor, so that it can output a comparison signal that shows whether the amplifying part 3 amplifies with a normal amplification factor or not.
  • an Electronic Control Unit (ECU) of vehicles can determine whether the amplifying part 3 is normal or not based on the detection signal output from the detecting device 1.
  • the detecting device 1 can detect, for example, an abnormality of the Hall sensor 2 after it is determined that the amplifying part 3 is normal.
  • the switches 50, 51 and 54 are allowed to be the on-state, and the switches 52 and 53 are allowed to be the off-state.
  • the comparing part 6 compares an amplification voltage obtained by differentially amplifying the divided voltage V 12 and the divided voltage V 34 output from the Hall sensor 2, and an amplification voltage amplified with a predetermined amplification factor.
  • the Hall sensor 2 is configured, in an initial state, such that the divided voltage V 12 and the divided voltage V 34 become zero, thus in a case that the amplification voltage V 3 is within an acceptable range centered on zero, the comparing part 6 outputs a comparison signal that shows a normality of the Hall sensor 2, and in a case other than the above-mentioned case, the comparing part 6 outputs a comparison signal that shows an abnormality of the Hall sensor 2.
  • the detecting device 1 it can be determined whether the amplification factor is a predetermined amplification factor or not, and can detect an abnormality in sensitivity.
  • the detecting device 1 compares by using an amplification voltage obtained by differentially amplifying the reference voltage V 1 and the reference voltage V 2 supplied from the reference voltage supply part 4, thus it is less affected by the influence of an electromagnetic noise, and it can output a comparison signal that shows whether the amplifying part 3 functions normally or not in comparison with a case that an amplification voltage obtained by amplifying an output of the Hall sensor is used.
  • the detecting device 1 in accordance with the embodiment, it can output a comparison signal that shows whether the Hall sensor 2 functions normally or not after it is determined that the amplifying part 3 functions normally, thus it can output a comparison signal that more precisely shows whether the Hall sensor 2 functions normally or not, in comparison with a case that a detection of abnormality of the Hall sensor 2 is executed based on a signal obtained by amplifying the output of the Hall sensor 2 at the amplifying part without executing a detection of abnormality of the amplifying part.
  • the second embodiment is different from the first embodiment in using a magnetoresistance (MR) sensor 2a as a detecting part, and executing a detection of abnormality of the MR sensor 2a in addition to a detection of abnormality of the amplification factor of the amplifying part 3.
  • MR magnetoresistance
  • FIG.2 is a block diagram schematically showing a detecting device according to a second embodiment of the invention.
  • the MR sensor 2a according to the embodiment is configured, for example, as shown in FIG.2, such that a bridge circuit is formed by four magnetic sensor elements (magnetoresistance elements) 24 to 27.
  • the magnetoresistance element (first magnetic sensor element) 24 has, for example, a resistance value of R 3 .
  • the magnetoresistance element (second magnetic sensor element) 25 has, for example, a resistance value of R 4 .
  • One end of the magnetoresistance element 24 is electrically connected to one end of the magnetoresistance element 26, and simultaneously electrically connected to the input terminal 10.
  • another end of the magnetoresistance element 24 is electrically connected to one end of the magnetoresistance element 25.
  • Another end of the magnetoresistance element 25 is electrically connected to the GND terminal 11.
  • a voltage V cc is applied to the MR sensor 2a via the input terminal 10.
  • the voltage V cc according to the embodiment is, as one example, 5V.
  • the magnetoresistance element (third magnetic sensor element) 26 has, for example, a resistance value of R 5 .
  • the magnetoresistance element (fourth magnetic sensor element) 27 has, for example, a resistance value of R 6 .
  • Another end of the magnetoresistance element 26 is electrically connected to one end of the magnetoresistance element 27.
  • Another end of the magnetoresistance element 27 is electrically connected to another end of the magnetoresistance element 25, and simultaneously electrically connected to the GND terminal 11.
  • the MR sensor 2a is configured such that the resistance values R 3 to R 6 vary dependent on strength of a magnetic field.
  • the magnetoresistance elements 24 to 27 are configured to, for example, have the same resistance value with each other in case that the detecting device 1 is situated in an initial state.
  • the MR sensor 2a is configured, for example, such that in an initial state, a divided voltage V 12 as a first divided voltage of the magnetoresistance element 24 and the magnetoresistance element 25, and a divided voltage V 34 as a second divided voltage of the magnetoresistance element 26 and the magnetoresistance element 27 are equalized.
  • the divided voltage V 12 and the divided voltage V 34 according to the embodiment are, as one example, 2.5 V.
  • the initial state means, for example, a state that an amplification signal obtained by differentially amplifying the divided voltage V 12 and the divided voltage V 34 becomes zero.
  • the switch information 80 of the detecting device 1 includes, for example, information on a third mode configured to detect an abnormality of the MR sensor 2a in addition to the first and second modes in the first embodiment.
  • the third mode includes, for example, as shown in Table 1 below, a first phase and a second phase.
  • the first phase is configured to detect an abnormality of the magnetoresistance element 24 or the magnetoresistance element 25 of the MR sensor 2a.
  • the second phase is configured to detect an abnormality of the magnetoresistance element 26 or the magnetoresistance element 27 of the MR sensor 2a.
  • the first phase is configured to, for example, as shown in Table 1, allow the switch 50 to be the on-state, the switch 51 to be the off-state, the switch 52 to be the off-state, the switch 53 to be the on-state, and the switch 54 to be the on-state. Consequently, to an inverting input terminal (-) of the operational amplifier 30 of the amplifying part 3, the divided voltage V 12 is input, and to a non-inverting input terminal (+), the reference voltage V 2 output from the reference voltage supply part 4 is input.
  • the second phase is configured to, for example, as shown in Table 1, allow the switch 50 to be the off-state, the switch 51 to be the on-state, the switch 52 to be the on-state, the switch 53 to be the off-state, and the switch 54 to be the on-state. Consequently, to an inverting input terminal (-) of the operational amplifier 30 of the amplifying part 3, the reference voltage V 1 output from the reference voltage supply part 4 is input, and to a non-inverting input terminal (+), the divided voltage V 34 is input. Further, the third mode is configured to, for example, be executed subsequently to the first mode, and further the second phase is executed subsequently to the first phase.
  • the reference voltage supply part 4 When the detecting device 1 is situated in the third mode, the reference voltage supply part 4 generates, as one example, the reference voltage V 1 and the reference voltage V 2 of 2.5 V. This is due to the fact that if the detecting device 1 is situated in the initial state, the divided voltage V 12 and the divided voltage V 34 is, for example, 2.5 V in case that the MR sensor 2a functions normally.
  • the comparing part 6 is configured to, as one example, in the first phase, compare the amplification voltage V 3 obtained by differentially amplifying the divided voltage V 12 and the reference voltage V 2 , and a predetermined amplification voltage obtained by being differentially amplified based on the output of the MR sensor 2a situated in the initial state, with a predetermined amplification factor in the amplifying part 3.
  • the comparing part 6 outputs, for example, when the amplification voltage V 3 is other than 0 V, a comparison signal showing that an abnormality of the magnetoresistance element 24 or the magnetoresistance element 25 is detected.
  • the comparing part 6 is configured to, as one example, in the second phase, compare the amplification voltage V 3 obtained by differentially amplifying the reference voltage V 1 and the divided voltage V 34 , and a predetermined amplification voltage obtained by being differentially amplified based on the output of the MR sensor 2a situated in the initial state, with a predetermined amplification factor in the amplifying part 3.
  • the comparing part 6 outputs, for example, when the amplification voltage V 3 is other than 0 V, a comparison signal showing that an abnormality of the magnetoresistance element 26 or the magnetoresistance element 27 is detected.
  • the control part 7 switches the switching part 5 in response to the first mode based on the control signal input, so as to allow the reference voltage supply part 4, the amplifying part 3 and the comparing part 6 to be electrically connected with each other.
  • the reference voltage supply part 4 supplies the reference voltage V 1 and the reference voltage V 2 to the amplifying part 3.
  • the amplifying part 3 outputs the amplification voltage V 3 obtained by differentially amplifying the reference voltage V 1 and the reference voltage V 2 input, to the comparing part 6 via the switch 54.
  • the comparing part 6 compares an amplification voltage obtained by differentially amplifying the reference voltage V 1 and the reference voltage V 2 with a predetermined amplification factor to the amplification voltage V 3 actually output.
  • the comparing part 6 outputs the comparison result as a comparison signal.
  • control part 7 of the detecting device 1 executes the third mode based on the comparison signal obtained, if an abnormal of the amplification factor of the amplifying part 3 is not detected in the first mode.
  • the control part 7 switches the switching part 5 in response to the first phase of the third mode so as to allow the magnetoresistance elements 24 and 25 and the amplifying part 3, the reference voltage supply part 4 and the amplifying part 3, and the amplifying part 3 and the comparing part 6 to be electrically connected with each other.
  • the reference voltage supply part 4 supplies the reference voltage V 2 to the amplifying part 3.
  • the amplifying part 3 outputs the amplification voltage V 3 obtained by differentially amplifying the divided voltage V 12 output from the MR sensor 2a and the reference voltage V 2 output from the reference voltage supply part 4, to the comparing part 6 via the switch 54.
  • the comparing part 6 compares an amplification voltage obtained by differentially amplifying the divided voltage V 12 and the reference voltage V 2 with a predetermined amplification factor, to the amplification voltage V 3 actually output.
  • control part 7 executes the second phase subsequently, if an abnormality is not detected based on the comparison result. Further, if the abnormality is detected, the comparing part 6 outputs a comparison signal showing an abnormality of the MR sensor 2a.
  • control part 7 switches the switching part 5 in response to the second phase of the third mode so as to allow the magnetoresistance elements 26 and 27 and the amplifying part 3, the reference voltage supply part 4 and the amplifying part 3, and the amplifying part 3 and the comparing part 6 to be electrically connected with each other.
  • the reference voltage supply part 4 supplies the reference voltage V 1 to the amplifying part 3.
  • the amplifying part 3 outputs the amplification voltage V 3 obtained by differentially amplifying the reference voltage V 1 output from the reference voltage supply part 4 and the divided voltage V 34 output from the MR sensor 2a, to the comparing part 6 via the switch 54.
  • the comparing part 6 compares an amplification voltage obtained by differentially amplifying the reference voltage V 1 and the divided voltage V 34 with a predetermined amplification factor, to the amplification voltage V 3 actually output.
  • control part 7 executes the second phase subsequently, if an abnormality is not detected based on the comparison result. Further, if the abnormality is detected, the comparing part 6 outputs a comparison signal showing an abnormality of the MR sensor 2a.
  • an abnormality of the MR sensor 2a can be detected.
  • the reference voltage V 1 and the reference voltage V 2 corresponding to the divided voltage V 12 and the divided voltage V 34 in an initial state can be supplied to the amplifying part 3 by the reference voltage supply part 4, thus the detection of abnormality can be more precisely executed, in comparison with a case that the detection is executed based on an output from the Hall sensor.
  • the third embodiment is different from the above-mentioned embodiments in using the detecting device 1 according to the first embodiment as a current sensor.
  • FIG.3A is an explanatory view schematically showing a relationship between a current sensor according to the third embodiment and a three phase motor
  • FIG.3B is an explanatory view schematically showing a relationship between three currents and a rotation angle of the three phase motor
  • FIG.3C is an explanatory view schematically showing a relationship between a current sensor according to Comparative Example 1 and a three phase motor
  • FIG.3D is an explanatory view schematically showing a relationship between a current sensor according to Comparative Example 2 and a three phase motor.
  • An x-y coordinate that is a left drawing shown in FIG.3B has its origin at the rotation center of a three-phase motor 9.
  • a right drawing shown in FIG.3B shows a relationship between current I (vertical axis) and rotation angle theta (horizontal axis).
  • the current sensor 1a is disposed on, for example, as shown in FIG.3A, a power-supply line of a U phase of the three-phase motor 9.
  • the current sensor 1b is disposed on, for example, as shown in FIG.3A, a power-supply line of a W phase of the three-phase motor 9.
  • the current sensor 1a and the current sensor 1b have the same configuration as that of the detecting device 1 according to the first embodiment.
  • the three-phase motor 9 for example, as shown in FIG.3B, is used for a driving source of hybrid vehicles, and a current I U of a U phase, a current I V of a V phase and a current I W of a W phase that have respectively a phase different from each other by 120 degrees flow through the three-phase motor 9.
  • the current sensor 1a and the current sensor 1b are configured to detect a current that flows through the three-phase motor 9. Further, the current sensor 1a and the current sensor 1b according to the embodiment do not execute a detection of the current I V for the following reason. As shown in FIG.3B, the current I U , the current I V and the current I W have respectively a phase different from each other by 120 degrees, and the sum of the three currents at the rotation angle theta of the time t 1 of the three-phase motor 9 becomes zero.
  • the current sensor 1a and the current sensor 1b for example, output a detection signal to the Electronic Control Unit (ECU) 90 mounted on vehicles.
  • ECU Electronic Control Unit
  • the ECU 90 is configured to, for example, calculate a value of the current I V based on the two detection signals output from the current sensor 1a and the current sensor 1b, so as to judge whether the currents are properly supplied to the three-phase motor 9 or not.
  • the ECU 90 is configured to, for example, execute diagnosis for failure such as sensitivity misalignment of the current sensor 1a and the current sensor 1b based on the two comparison signals output from the current sensor 1a and the current sensor 1b after a power-supply of vehicles is applied.
  • Comparative Example 1 shown in FIG.3C is configured to include current sensors 901 and 902 disposed on the power-supply line of the U phase, and current sensors 903 and 904 disposed on the power-supply line of the W phase.
  • Each of the current sensors 901 to 904 is a well-known current sensor.
  • Comparative Example 1 has a configuration that two current sensors are disposed on one power-supply line, so as to have redundancy.
  • Comparative Example 2 shown in FIG.3D is configured to include the current sensor 905 disposed on the power-supply line of the U phase, the current sensor 906 disposed on the power-supply line of the V phase and the current sensor 907 disposed on the power-supply line of the W phase.
  • Each of the current sensors 905 to 907 is a well-known current sensor.
  • Comparative Example 2 From any two current values of the U, V and W phases, the remaining current value can be calculated, thus on the assumption that any one of the current sensors 905 to 907 fails to operate properly, Comparative Example 2 has a configuration that one of the current sensors is disposed on each of the power-supply lines, so as to have redundancy.
  • the detecting device 1 according to the first embodiment is used for the current sensor
  • diagnosis for failure such as sensitivity misalignment is executed by using an application of power-supply as a trigger, consequently the fact eliminates the need for the detecting device having redundancy, so that the number of the current sensor can be reduced in comparison with Comparative Examples 1 and 2.
  • a comparative signal that is capable of determining failures such as a sensitivity misalignment of the Hall sensor and the amplifying part is output, consequently the number of current sensor to be disposed can be reduced, and production cost of an electronic device on which the current sensor according to the embodiment is mounted can be also reduced, in comparison with a detecting device that is not capable of determining failures of the Hall sensor and the amplifying part separately from each other.
  • ⁇ Modification 1> As the feedback resistance 32 of the amplifying part 3, for example, a variable resistance in which the resistance value can be varied by an operation from outside can be used.
  • a configuration can be used that includes a plurality of resistances and a plurality of switches having the same number as the plurality of resistances, such that the amplification factor of the amplifying part 3 can be changed by shifting the switches.
  • the detecting device 1 can include a judging part configured to judge an abnormality of the detecting part and the amplifying part 3 based on a comparison signal output from the comparing part 6.
  • an acceleration sensor or the like configured to detect a change in an electrical capacity can be also used.
  • the current sensor 1a and the current sensor 1b are respectively configured to, as one example, be used as a current sensor detecting a current of a three phase motor, but they are not limited to this, they can be also used as a current sensor detecting a current of the other electronic device.

Abstract

La présente invention concerne un dispositif de détection qui comprend une partie de détection conçue pour détecter un changement dans un objet soumis à une détection de manière à produire un signal de sortie, une partie d'amplification conçue pour amplifier le signal de détection produit par la partie de détection, afin de produire un premier signal amplifié, une partie d'alimentation en tension de référence conçue pour fournir une tension de référence à la partie d'amplification, la tension de référence étant introduite dans la partie d'amplification pour être traitée et produire un second signal amplifié, une partie de commutation conçue pour commuter une connexion entre la partie de détection et la partie d'amplification ou une connexion entre la partie d'amplification et la partie d'alimentation en tension de référence, sur la base d'une entrée d'un signal de commande, et une partie de comparaison conçue pour comparer un facteur d'amplification prédéterminé dans la partie d'amplification à un facteur d'amplification obtenu à partir du second signal amplifié de manière à produire le résultat de la comparaison sous forme d'un signal de comparaison.
PCT/JP2012/003508 2011-05-30 2012-05-29 Dispositif de détection et capteur de courant WO2012164915A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP12737616.8A EP2715385B1 (fr) 2011-05-30 2012-05-29 Dispositif de détection et capteur de courant
US14/118,759 US9291666B2 (en) 2011-05-30 2012-05-29 Detecting device and current sensor
CN201280026636.2A CN103703382B (zh) 2011-05-30 2012-05-29 检测装置和电流传感器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011-120195 2011-05-30
JP2011120195A JP6033529B2 (ja) 2011-05-30 2011-05-30 検出装置および電流センサ

Publications (2)

Publication Number Publication Date
WO2012164915A2 true WO2012164915A2 (fr) 2012-12-06
WO2012164915A3 WO2012164915A3 (fr) 2013-02-14

Family

ID=46545842

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2012/003508 WO2012164915A2 (fr) 2011-05-30 2012-05-29 Dispositif de détection et capteur de courant

Country Status (5)

Country Link
US (1) US9291666B2 (fr)
EP (1) EP2715385B1 (fr)
JP (1) JP6033529B2 (fr)
CN (1) CN103703382B (fr)
WO (1) WO2012164915A2 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015100214A3 (fr) * 2013-12-26 2015-11-19 Allegro Microsystems, Llc Procédés et appareil pour diagnostics de capteurs
CN105655982A (zh) * 2016-03-28 2016-06-08 广州七喜智能设备有限公司 变频器输出电流检测电路及其检测方法
US9383425B2 (en) 2012-12-28 2016-07-05 Allegro Microsystems, Llc Methods and apparatus for a current sensor having fault detection and self test functionality
EP3044603A1 (fr) * 2013-09-10 2016-07-20 Fisher Controls International Llc Système de capteur à effet hall doté de capacités de diagnostic
US10527703B2 (en) 2015-12-16 2020-01-07 Allegro Microsystems, Llc Circuits and techniques for performing self-test diagnostics in a magnetic field sensor
US11194004B2 (en) 2020-02-12 2021-12-07 Allegro Microsystems, Llc Diagnostic circuits and methods for sensor test circuits

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101525209B1 (ko) * 2008-11-04 2015-06-05 삼성전자주식회사 모듈 테스트 장치 및 그것을 포함하는 테스트 시스템
JP6446859B2 (ja) * 2014-06-27 2019-01-09 ヤマハ株式会社 集積回路
CN104280599B (zh) * 2014-10-29 2017-02-15 国网四川省电力公司电力科学研究院 一种三相电压信号检测告警电路
JP6355820B2 (ja) * 2015-03-05 2018-07-11 三菱電機株式会社 磁気検出装置
KR20160126180A (ko) * 2015-04-23 2016-11-02 현대자동차주식회사 친환경차량용 배터리 시스템의 전류검출기 고장진단 장치 및 방법
JP2016223802A (ja) * 2015-05-27 2016-12-28 ファナック株式会社 製造不良や損傷・劣化を検出する機能を備えた電子部品およびプリント基板
US10436856B2 (en) * 2015-12-24 2019-10-08 Asahi Kasei Microdevices Corporation Magnetic sensor apparatus and current sensor apparatus
KR102035676B1 (ko) * 2015-12-28 2019-10-23 주식회사 엘지화학 전류센서의 이득을 사용하여 bms의 전류센서 설정 값을 자동으로 설정하는 장치 및 방법
JP2017161409A (ja) * 2016-03-10 2017-09-14 住友電気工業株式会社 電圧検出装置、電流検出装置及びコンピュータプログラム
DE102016220948A1 (de) * 2016-10-25 2018-04-26 Robert Bosch Gmbh Vorrichtung und Verfahren zur Diagnose der Erfassung eines mehrphasigen elektrischen Stroms
TWI633319B (zh) * 2017-02-23 2018-08-21 愛盛科技股份有限公司 磁場感測裝置及感測方法
CN108469595B (zh) 2017-02-23 2020-08-11 爱盛科技股份有限公司 磁场感测装置及感测方法
EP3401646B1 (fr) * 2017-05-09 2020-04-15 Melexis Technologies SA Vérification d'erreur de capteur à pont
DE102017211476A1 (de) * 2017-07-05 2019-01-10 Robert Bosch Gmbh Vorrichtung und Verfahren zum Überprüfen einer Funktionsfähigkeit eines Systemwiderstands eines Batteriesystems
CN109387795B (zh) * 2017-08-09 2021-01-01 苏州市灵矽微系统有限公司 一种cmos磁传感器模拟前端电路
JP2021014986A (ja) * 2017-09-06 2021-02-12 株式会社村田製作所 電流センサ及び電流センサの製造方法
JP7006082B2 (ja) * 2017-09-26 2022-01-24 株式会社豊田自動織機 ゲイン切替回路診断装置
EP3470861B1 (fr) * 2017-10-10 2019-11-27 Melexis Technologies SA Détection de défaillance de capteur redondant
JP2019083622A (ja) * 2017-10-30 2019-05-30 日本電産株式会社 駆動回路
DE102018005676A1 (de) * 2018-07-19 2020-01-23 Tdk-Micronas Gmbh Hall-Sensor und Verfahren zum Betreiben eines solchen
BE1026732B1 (de) * 2018-10-26 2020-06-03 Phoenix Contact Gmbh & Co Messgerät
US11290043B2 (en) 2018-11-09 2022-03-29 Barrett Technology, Llc High performance current sensing architecture for brushless motors

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010133737A (ja) 2008-12-02 2010-06-17 Denso Corp 電流センサ装置、及び電流センサ自己診断装置
JP2011120195A (ja) 2009-11-05 2011-06-16 Sony Corp 受信装置、送信装置、通信システム、表示制御方法、プログラム、及びデータ構造

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4733177A (en) * 1985-01-28 1988-03-22 International Business Machines Corporation High resolution high output magneto resistive transducer for determining static and dynamic position
JPH0572243A (ja) * 1991-09-11 1993-03-23 Matsushita Electron Corp 集積回路装置の計測方法
JP3183565B2 (ja) * 1992-07-13 2001-07-09 カヤバ工業株式会社 センサの故障検出装置
JP3001454B2 (ja) * 1997-04-23 2000-01-24 日本電気アイシーマイコンシステム株式会社 半導体装置
US6703132B1 (en) * 1999-12-22 2004-03-09 Mitsubishi Denki Kabushiki Kaisha Magnetoresistance sensor element and method of fabricating the magnetoresistance element
JP3649082B2 (ja) * 2000-04-25 2005-05-18 松下電工株式会社 演算増幅器の測定回路及びその測定方法
JP4669146B2 (ja) * 2001-03-26 2011-04-13 新コスモス電機株式会社 ガス検知装置
KR100507469B1 (ko) 2003-03-05 2005-08-09 현대자동차주식회사 전기자동차의 배터리 모듈 전압 검출 방법 및 장치
JP4592470B2 (ja) * 2005-03-30 2010-12-01 富士通セミコンダクター株式会社 増幅回路及び増幅回路の制御方法
JP4847060B2 (ja) * 2005-07-15 2011-12-28 日立オートモティブシステムズ株式会社 交流モータ駆動装置及びその制御方法
JP4749132B2 (ja) * 2005-11-21 2011-08-17 富士通セミコンダクター株式会社 センサ検出装置及びセンサ
JP2008032431A (ja) * 2006-07-26 2008-02-14 Rohm Co Ltd 磁気センサ回路、半導体装置、磁気センサ装置
JP5128910B2 (ja) * 2007-11-14 2013-01-23 旭化成エレクトロニクス株式会社 温度補正装置及び温度補正方法
JP4649489B2 (ja) * 2008-03-27 2011-03-09 株式会社日立製作所 組電池の総電圧検出回路
JP2010048717A (ja) * 2008-08-22 2010-03-04 Tokai Rika Co Ltd 位置検出装置
JP2010175276A (ja) * 2009-01-27 2010-08-12 Tdk Corp 磁気比例式電流センサ
JP2010181211A (ja) * 2009-02-04 2010-08-19 Tdk Corp 電流センサ及びそれに用いられる磁気検出素子の温度特性補償方法
JP5634041B2 (ja) * 2009-02-17 2014-12-03 ローム株式会社 磁気センサ、およびこれを備えた電子機器
JP5225938B2 (ja) * 2009-06-08 2013-07-03 セイコーインスツル株式会社 磁気センサ装置
DE102009034595B4 (de) * 2009-07-24 2014-09-04 Conti Temic Microelectronic Gmbh Verfahren zur Diagnose von Stromsensoren einer Drehfeldmaschine während deren Betriebs

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010133737A (ja) 2008-12-02 2010-06-17 Denso Corp 電流センサ装置、及び電流センサ自己診断装置
JP2011120195A (ja) 2009-11-05 2011-06-16 Sony Corp 受信装置、送信装置、通信システム、表示制御方法、プログラム、及びデータ構造

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9383425B2 (en) 2012-12-28 2016-07-05 Allegro Microsystems, Llc Methods and apparatus for a current sensor having fault detection and self test functionality
EP3044603A1 (fr) * 2013-09-10 2016-07-20 Fisher Controls International Llc Système de capteur à effet hall doté de capacités de diagnostic
EP3044603B1 (fr) * 2013-09-10 2017-11-08 Fisher Controls International Llc Système de capteur à effet hall doté de capacités de diagnostic
US9910088B2 (en) 2013-12-26 2018-03-06 Allegro Microsystems, Llc Methods and apparatus for sensor diagnostics including programmable self-test signals
KR20160102450A (ko) 2013-12-26 2016-08-30 알레그로 마이크로시스템스, 엘엘씨 센서 진단 방법 및 장치
WO2015100214A3 (fr) * 2013-12-26 2015-11-19 Allegro Microsystems, Llc Procédés et appareil pour diagnostics de capteurs
US10073136B2 (en) 2013-12-26 2018-09-11 Allegro Microsystems, Llc Methods and apparatus for sensor diagnostics including sensing element operation
US10488458B2 (en) 2013-12-26 2019-11-26 Allegro Microsystems, Llc Methods and apparatus for sensor diagnostics
KR102261944B1 (ko) * 2013-12-26 2021-06-07 알레그로 마이크로시스템스, 엘엘씨 센서 진단 방법 및 장치
US11313899B2 (en) 2013-12-26 2022-04-26 Allegro Microsystems, Llc Methods and apparatus for sensor diagnostics
US10527703B2 (en) 2015-12-16 2020-01-07 Allegro Microsystems, Llc Circuits and techniques for performing self-test diagnostics in a magnetic field sensor
CN105655982A (zh) * 2016-03-28 2016-06-08 广州七喜智能设备有限公司 变频器输出电流检测电路及其检测方法
US11194004B2 (en) 2020-02-12 2021-12-07 Allegro Microsystems, Llc Diagnostic circuits and methods for sensor test circuits

Also Published As

Publication number Publication date
WO2012164915A3 (fr) 2013-02-14
CN103703382A (zh) 2014-04-02
JP2012247341A (ja) 2012-12-13
CN103703382B (zh) 2016-03-02
JP6033529B2 (ja) 2016-11-30
US20140159756A1 (en) 2014-06-12
US9291666B2 (en) 2016-03-22
EP2715385B1 (fr) 2015-03-04
EP2715385A2 (fr) 2014-04-09

Similar Documents

Publication Publication Date Title
US9291666B2 (en) Detecting device and current sensor
US10353018B2 (en) Highly efficient diagnostic methods for monolithic sensor systems
CN109416382B (zh) 接地损耗检测电路
US9465087B2 (en) Hall effect sensor
US11131720B2 (en) Electronic control device
US10502589B2 (en) XMR angle sensor arrangement with safety mechanism and method for monitoring the same
CN110595524B (zh) 传感器饱和故障检测
KR101950710B1 (ko) 누전 차단기와 같은 응용을 위한 고정밀 차동 전류 센서
JP2007078416A (ja) 電流センサおよび電流検出方法
JP7280135B2 (ja) ホールセンサ及びこのようなセンサを動作させる方法
JP2010175276A (ja) 磁気比例式電流センサ
JP2006105932A (ja) ブリッジ回路を有するセンサの故障判定装置およびその故障判定方法
JP5678287B2 (ja) 電流センサ
JPWO2010100754A1 (ja) 検出システム及び電気システム
JP2012073062A (ja) 磁気センサデバイス
US20210247423A1 (en) System, motor vehicle
JP6540584B2 (ja) 検知装置
JP2021051037A (ja) 検出装置
JP2013024616A (ja) 圧力センサ

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12737616

Country of ref document: EP

Kind code of ref document: A2

NENP Non-entry into the national phase in:

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 2012737616

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 14118759

Country of ref document: US